Staff: Mentor

is there any way to find vector in cylindrical system without converting the variable of cylindrical system to Cartesian system?
advanced thanks

Is there a specific problem involved, and, if so, what is it? Are you trying to represent a position vector from the origin to a particular location in space using cylindrical coordinates? If this is the case, the vector is simply (r ir + z iz), where the i's are the unit vectors in cylindrical coordinates.